Make LED light up when ball bounces. Control wind from analog sensor.

​

Arduino code:

https://github.com/vsharkovski/nyuad-coursework/blob/main/introim/arduino/ball-wind/ball-wind.ino

*/

​

let velocity;

let gravity;

let position;

let acceleration;

let wind;

let drag = 0.99;

let mass = 50;

​

// Last ball bounce frame, and how many frames to send "bouncing"

// signal to Arduino.

let lastBallBounceFrame = -100;

let bounceFrames = 10;

let isBouncing = 0;

​

function setup() {

  createCanvas(640, 360);

  stroke(0);

  textSize(18);

  position = createVector(width / 2, 0);

  velocity = createVector(0, 0);

  acceleration = createVector(0, 0);

  gravity = createVector(0, 0.5 * mass);

  wind = createVector(0, 0);

}

​

function draw() {

  background(255);

​

  fill(0);

  noStroke();

  if (!serialActive) {

    text("Press Enter to select Serial Port", 20, 30);

    return;

  }

  text("Connected", 20, 30);

  // Determine whether currently bouncing.

  isBouncing = lastBallBounceFrame + bounceFrames > frameCount ? 1 : 0;

​

  applyForce(wind);

  applyForce(gravity);

  velocity.add(acceleration);

  velocity.mult(drag);

  position.add(velocity);

  acceleration.mult(0);

  fill(100);

  ellipse(position.x, position.y, mass, mass);

​

  if (position.y > height - mass / 2) {

    // Bouncing.

    velocity.y *= -0.9; // A little dampening when hitting the bottom

    position.y = height - mass / 2;

​

    lastBallBounceFrame = frameCount;

  }

}

​

function readSerial(data) {

  if (data != null) {

    // Read from Arduino.

    // Make sure there is actually a message. Split the message.

    let fromArduino = split(trim(data), ",");

​

    if (fromArduino.length == 1) {

      let potPosition = int(fromArduino[0]);

      // Set wind based on sensor position.

      wind.x = map(potPosition, 0, 1023, -3, 3);

    }

    // Send to Arduino whether currently bouncing.

    let sendToArduino = `${isBouncing}\n`;

    writeSerial(sendToArduino);

  }

}

​

function applyForce(force) {

  // Newton's 2nd law: F = M * A

  // or A = F / M

  let f = p5.Vector.div(force, mass);

  acceleration.add(f);

}

​

function keyPressed() {

  if (keyCode == ENTER) {

    setUpSerial();

  } else if (key == " ") {

    mass = random(15, 80);

    position.y = -mass;

    position.x = width / 2;

    velocity.mult(0);

  }

}

​